JP4057742B2 - Construction machine travel lever locking device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of a safety lock device for a travel lever in a construction machine that can be loaded and unloaded from both left and right sides.
[0002]
[Prior art]
Conventional construction machines employ a locking device that locks an operation lever to ensure safety when an operator gets off the construction machine. In recent years, a locking device has been adopted for a traveling lever that controls a traveling hydraulic motor. In addition, among conventional construction machines, there is also a construction machine in which a work machine base end portion is provided at a front end portion of an upper swing body so as to be able to get on and off from both the left and right sides, particularly in a small construction machine. In this case as well, it is desirable to lock the traveling lever by providing lock levers on both the left and right sides to ensure safety. Hereinafter, a conventional travel lever locking device will be described.
[0003]
Japanese Patent Publication No. 2582937 discloses a traveling lever locking device as shown in FIGS. 8 and 9 (hereinafter referred to as the conventional device 1). In the figure, the travel lever 11 is rotatably supported by a rotation support shaft 12 provided below the floor 13. A pedal 14 for operating the travel lever is provided below the travel lever and on the floor. Further, a member 15 is provided below the rotation support shaft of the traveling lever 11 so as to extend downward. One end of a cable 16 is attached to the member 15, and the other end of the cable 16 is connected to a traveling direction switching valve (not shown).
[0004]
The member 15 is inserted into a “soil” -shaped slot 18 provided in the plate 17 so as to be freely movable in the left-right direction in FIG. A spring 19 and a pull cable 20 are connected to the plate 17 on both sides. When the plate 17 is pulled in the direction of arrow A by the pull cable 20 (as shown), the lock is released, and when the pull cable 20 is loosened, the spring force is applied. The plate 17 is pulled in the direction of arrow B, and the travel lever 11 is locked.
[0005]
A console box 21 is provided on the floor 13, and a control device is disposed inside the console box 21. A turning operation lever 22 is provided on the upper front side of the console box 21, and a lock lever 24 is rotatably provided on the front side thereof by a rotation support shaft 25. A member 26 is fixed to the rotation support shaft 25, one end of a rod 27 is connected to the member 26, and the other end is connected to a lock valve 28 that cuts off the primary pressure of the pilot hydraulic pressure. A link 29 is fixed to the rotation support shaft 25, and one end of the pull cable 20 is connected to the lower end of the link 29.
[0006]
The conventional apparatus 1 performs the lock function as follows with the above configuration. That is, when the lock lever 24 is raised in the lock direction (turned clockwise), the tip of the link 29 moves to the left and the pull cable 20 is loosened. The plate 17 is moved in the direction of arrow B by the spring 19 and the member 15 comes to the narrow part of the earth-shaped slot. Therefore, the movement of the member 15 in the left-right direction in FIG. 9 is restricted, and the travel lever 11 is locked. At the same time, the lock valve 28 is locked by the operation of the member 26.
[0007]
FIG. 10 shows another conventional apparatus (hereinafter referred to as conventional apparatus 2) disclosed in Japanese Utility Model Publication No. 7-15859. In FIG. 10, the same components as those in the conventional apparatus 1 are denoted by the same reference numerals, and the description will be simplified. In FIG. 10, a pedal 14 is fixed to the lower portion of the traveling lever 11 and is supported rotatably by a support pin 31. A lower plate 32 is fixed to the lower portion of the traveling lever 11 below the floor 13. One end of the pull cable 16 is connected to the lower plate 32, and the other end is connected to the traveling direction switching valve.
[0008]
An engagement receiving portion 33 is provided on the back surface of the lower end of the lower plate 32. A speed reduction motor 34 is disposed at an appropriate position on the floor 13, a link 36 is connected to a drive shaft 35 of the speed reduction motor 34, and an engagement protrusion 37 that engages with the engagement receiving portion 33 is provided at the tip of the link 36. It has been. The reduction motor 34 can rotate forward and backward, and is operated by a limit switch provided on a lock lever (not shown). That is, when the gate lock lever is in a locked state (a state where the operator can get off), the link 36 rotates counterclockwise.
[0009]
When the traveling lever 11 is in a neutral state, the engaging protrusion 37 engages with the engagement receiving portion 33 to lock the traveling lever 11. When the gate lock lever changes from the locked state to the unlocked state, the limit switch is turned off, the link 36 rotates in the clockwise direction, the engagement protrusion 37 is disengaged from the engagement receiving portion 33, and the travel lever 11 can be operated. It becomes.
[0010]
In addition to this, when the switching operation of the gate lock lever is detected by an electric signal and the gate lock lever is operated to the lock side, the hydraulic circuit from the hydraulic pump to the travel control valve is shut off by a solenoid valve or the like. In some cases, the travel lever cannot be operated (hereinafter referred to as the conventional device 3).
[0011]
[Problems to be solved by the invention]
Conventional devices 1 to 3 are travel lever lock devices when only one gate lock lever is provided. Therefore, although it is unclear about the configuration when two gate lock levers are provided on both the left and right sides, it is conceivable to provide two identical devices. However, in the conventional apparatus 1, the member 15 provided at the lower portion of the traveling lever 11 is inserted into the earth-shaped slot provided in the plate 17, and the plate 17 is moved at a right angle to the moving direction of the traveling lever. The travel lever 11 is locked and unlocked by restricting or allowing the movement of the member 15, and the mechanism is complicated. Further, if the number of gate lock levers is two, the mechanism becomes more complicated and a problem arises. In addition, since the lock device is provided below the floor of the upper swing body, there is also a problem that it is difficult to check for a failure or the like.
[0012]
In the conventional apparatus 2, the lower plate 32 is fixed to the lower portion of the traveling lever 11, and the engagement portion 33 provided on the lower surface of the lower plate 32 and the link 36 provided on the drive shaft 35 of the reduction motor 34 are provided. Although the travel lever is locked by engaging with the engagement protrusion 37, it is unclear what configuration is used when two gate lock levers are provided, and difficult problems are expected. The conventional device 3 includes an electric system, and is considered to be unreliable in terms of occurrence of failure in a machine such as a hydraulic excavator that cannot avoid a large force and vibration, and uses a solenoid valve or the like. There is a problem in that the number of parts increases and the cost becomes high.
[0013]
The present invention has been made under the background as described above. When the gate lock levers are provided on both the left and right sides of the driver's seat, the gate lock device is simple in structure, compact, and has few troubles. It is an object to provide a simple gate lock device even in the case of expansion.
[0014]
[Means for Solving the Problems]
The present invention employs the following configuration as means for solving the above-described problems. That is, the invention according to claim 1 is provided with gate lock levers on the left and right sides of the seat for opening and closing the left and right passages on the right and left sides of the construction machine that can be loaded and unloaded from both the left and right sides. In the lock device for providing a mechanical lock device for preventing malfunction of the left and right travel levers, and mechanically connecting the gate lock lever and the lock device to lock the left and right travel levers ,
The locking device includes a first member and a second member fixedly mounted, notch and disengageably a first locking member of the first member of the left and right travel levers each having the notch of the left and right travel levers And a second lock member detachably engageable with a notch portion of the second member of the left and right travel levers, and a spring means for holding each lock member in an engaged state, and the left and right gate locks Each of the levers is connected to the first lock member and the second lock member by a pull cable, and the first lock member and the second lock member are notched when the left and right gate lock levers are operated to the unlock side. It is characterized by having been withdrawn from the club.
[0015]
According to a second aspect of the present invention, in the first aspect of the present invention, the locking device is configured such that the first member and the second member are integrally formed so that the notch portions are at both ends. Fixed to the pivot part of the left and right travel levers, a lock pin that engages with the notch part is rotatably provided at a position opposite to the center line of the pivot axis, and the lock pin is given a biasing force by a torsion coil spring. The pulling cable generates a tensile force when both the gate lock levers are operated to the unlock side while being held in an engaged state, and the lock pin is separated from the notch. It is said.
[0016]
According to a third aspect of the present invention, gate lock levers for opening and closing the left and right passages on the left and right sides of the construction machine that can be loaded and unloaded from both the left and right sides are provided on the left and right sides of the seat, and the left and right sides for running the construction machine are provided. In the lock device which is provided with a mechanical lock device for preventing malfunction of the travel lever, and mechanically connects the gate lock lever and the lock device to lock the left and right travel levers,
The locking device is provided with a member having a notch portion on both of the travel levers, a lock member is provided in each notch portion in a freely detachable manner, and a spring means for holding the lock member in a detached state is provided. Connect the output side of the pull adder to the lock member, connect one end of the pull cable to each of the left and right gate lock levers so that tension is generated when operated to the lock side, and connect the other end of the pull cable to the lock member When connected to the input side of the pull adder and one or both of the gate lock levers are operated to the lock side, tension is generated on the output side of the pull adder, and the lock member resists the spring force. And it is characterized by engaging with the notch.
[0017]
According to a fourth aspect of the present invention, gate lock levers for opening and closing the left and right passages on the left and right sides of the construction machine that can be loaded and unloaded from both the left and right sides are provided on the left and right sides of the seat, and the left and right sides for running the construction machine are provided. In the lock device which is provided with a mechanical lock device for preventing malfunction of the travel lever, and mechanically connects the gate lock lever and the lock device to lock the left and right travel levers,
The locking device is provided with a member having a notch portion on both of the travel levers, the lock member is detachably provided on the notch portion, and spring means for holding the lock member in an engaged state is provided. The output side of the pull multiplier is connected to the lock member, one end of the pull cable is connected to each of the gate lock levers so that tension is generated when operated to the unlock side, and the other end of the pull cable is connected to the pull member. Connected to the input side of the multiplier, and when one or both of the gate lock levers are operated to the lock side, the output side of the pull multiplier is loosened, and the lock member is engaged with the notch by the spring force. It is characterized by having matched.
[0018]
According to a fifth aspect of the present invention, the lock device according to the first to fourth aspects of the invention is characterized in that the travel lever is directly connected to the control end of the travel control valve by a connecting member. It is a feature.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
<Embodiment 1>
FIG. 1 is an overall side view showing the configuration of the first embodiment of the present invention, and FIG. 2 is a perspective view of the traveling lever locking device of the first embodiment. As shown in FIG. 2, the two traveling levers 51L and 51R are actually provided. However, since the left and right traveling levers 51L and 51R have the same configuration, The travel lever 51) will be described. In FIG. 1, a pivot shaft 52 is fixed below the traveling lever 51, and the pivot shaft 52 is rotatably supported by a bearing (not shown). A first member 53 having notches 53a at both ends and a second member 54 having notches 54a are fixed to the pivot 52. The lower end of the travel lever is connected to the spool of the travel control valve 50 via a connecting member 49. Note that the first member 53 and the second member 54 may be integrally formed.
[0021]
The lock pins 55 and 56 are rotatably provided at positions where the lock pins 55 and 56 can be engaged and disengaged with respect to the notches 53a and 54a. Torsion coil springs 57 and 58 are provided on the rotation support portions of the lock pins 55 and 56, and the lock pins 55 and 56 are urged to engage with the notches 53a and 54a. Further, rod members 59 and 60 are fixed to the lock pins 55 and 56. One ends of pull cables 61 and 62 are connected to the free ends of the bar members 59 and 60.
[0022]
On the other hand, gate lock levers 70 and 71 are provided on the left and right outer sides of the console boxes 68 and 69. The gate lock levers 70 and 71 are levers for locking the travel lever when the operator gets off the vehicle, and are provided in the getting-on / off passage for the operator. The solid line in the figure shows the unlocked state (passage closed) with the gate lock levers 70 and 71, and the dotted line shows the locked state (passage open). As shown in FIG. 3, the gate lock lever 70 is provided on the bracket 73 so as to be rotatable by a rotation shaft 79 and a bearing 72. The bracket 73 is provided on the side surface of the console box 74, for example. The solid line in the figure shows when the gate lock levers 70 and 71 are in the unlocked state (passage closed), and the dotted line in the figure shows the locked state (passage open). The detailed structure of the rotation support part of the gate lock lever 70 is shown in FIG. The gate lock lever 71 has the same configuration as the gate lock lever 70.
[0023]
FIG. 3 shows a detailed configuration of a rotation support portion of one gate lock lever 70. The gate lock lever 70 is provided on a bracket 73 so as to be rotatable by a rotation shaft 79 and a bearing 72. The bracket 73 is a side surface of the console box 74. Is provided. A member 75 is fixed to the rotating shaft 79, a locking portion 76 of the spring 77 is provided on the member 75, and another locking portion 78 is provided on the bracket 73. The spring 77 is attached to the locking portions 76 and 78 in a tensioned state, and becomes the shortest and stable state when the gate lock lever 70 is locked and unlocked. One end of the pull cable 61 is connected to the member 75. The pull cable 61 is connected so as to be pulled in an unlocked state (solid line in the figure). The gate lock lever 71 has the same configuration as the gate lock lever 70.
[0024]
The first embodiment is configured as described above and functions as follows. That is, when both the gate lock levers 70 and 71 are in the unlocked state (solid line in the figure), the pull cables 61 and 62 are pulled, and the lock pins 55 and 56 are in the detached state. Therefore, in this case, the travel lever 51 (actually both 51L and 51R) is in an unlocked state and can travel. When the gate lock lever 70 (or 71, the same applies hereinafter) is in a locked state (dotted line in the figure), the pull cable 61 (62) is loose and no tensile force is generated, so the torsion coil spring 57 (58) Due to the urging force, the lock pin 55 (56) is engaged with the notch 53a (54a), and the traveling lever 51 (both 51L and 51R is actually locked). Accordingly, when one or both of the gate lock levers 70 and 71 are operated to the lock side, the travel lever 51 becomes inoperable.
[0025]
As can be seen from the above-described configuration, the first embodiment employs a configuration in which a lock mechanism that can engage or disengage a lock pin with a notch is configured, and a lock mechanism and a gate lock device are connected by a pull cable. Therefore, the configuration is simple, and the traveling lever is directly connected to the spool of the traveling control valve. Therefore, the first embodiment has an effect of being compact and having few failures.
[0026]
<Embodiment 2>
FIG. 4 is a diagram illustrating the configuration of the second embodiment. In FIG. 4, the same components as those of the first embodiment (FIG. 1) are denoted by the same reference numerals, and detailed description thereof is omitted. The second embodiment is characterized in that the first member 53 fixed to the travel lever 51 and a lock device (such as the lock pin 55) related thereto are omitted. Hereinafter, the second embodiment will be described focusing on the differences.
[0027]
Unlike the first embodiment, the torsion coil spring 80 is biased in the direction in which the lock pin 56 is detached from the notch 54a (counterclockwise in the figure). One end of the pull cables 81 and 82 is connected to the member 75 of the gate lock levers 70 and 71, but unlike the case of the first embodiment, the pull cables 81 (82 when the gate lock lever 70 (71) is set to the lock side. ) Is tensioned and connected so that it will relax when it is unlocked. The opposite ends of the pull cables 81 and 82 are connected to the input side of the pull adder 83. The output side of the pull adder 83 is connected to the tip of the bar member 60 of the lock pin 56 via the pull cable 84.
[0028]
A configuration example of the pull adder 83 is shown in FIG. The pull adder 83 is a device in which when the tension P1 is applied to the pull cable 81 and the tension P2 is applied to the pull cable 82, the logical sum P3 (= P1 + P2) of the tensions P1 and P2 is generated as the tension on the output pull cable 84. It is. 5 includes a case 87, a slider 88 slidably provided inside the case 87, and a pull cable slidably inserted into holes 88a and 88a provided in the slider 88. 81, 82, stoppers 89, 89 connected to the ends of the pull cables 81, 82, and output cables 84 connected to the tension springs 86, 86 and the slider 88. As is clear from the above configuration, a pulling force is generated in the pull cable 84 when a pulling force is applied to the pull cable 81 or 82 or both.
[0029]
The second embodiment functions as follows with the above configuration. That is, when the gate lock lever 70 (or 71) is in the locked state (the position of the dotted line in the figure), the pull cable 81 (or 82) is pulled and tension is generated. When one or both of the pull cables 81 and 82 are pulled, the pull cable 84 is also pulled, and the rod member 60 is also pulled in the right direction in the figure, so that the lock pin 56 is notched against the spring force of the torsion coil spring 80. 54a is engaged, and the traveling lever 51 is locked. When both the gate lock levers 70 and 71 are in the unlocked state (the position of the solid line in the figure), both the pull cables 81 and 82 are relaxed, and the pull cable 84 is also relaxed. The lock pin 56 is disengaged from the notch 54a by the spring force of the torsion coil spring 80, and the traveling lever 51 is unlocked.
[0030]
In the second embodiment, the pull cables 81 and 82 are connected to the input side of the pull adder 83, and it is only necessary to connect the pull cable 84 on the output side to the bar member 60 constituting the lock device. The first member 53 and the locking device (lock pin 55 etc.) associated therewith are not required, and the pull cable can be shorter than that of the first embodiment. Therefore, the second embodiment is more compact and has fewer failures than the first embodiment. Furthermore, even when the number of lock levers is increased to two by simply using a pull cable connection and a pull adder. Since it can be used, it is possible to easily add to the existing apparatus.
[0031]
<Embodiment 3>
The configuration of the third embodiment is shown in FIG. In FIG. 6, the same components as those in the first embodiment (FIG. 1) are denoted by the same reference numerals, and detailed description thereof is omitted. The third embodiment is characterized in that the second member 54 fixed to the travel lever 51 and a lock device (such as the lock pin 56) related thereto are omitted. Hereinafter, the third embodiment will be described focusing on the differences. In the third embodiment, the traveling lever 51 side of the pull cables 61 and 62 is connected to the input end of the pull multiplier 91, and the output end is connected to the member 59 of the lock pin 55 via the pull cable 92.
[0032]
A configuration example of the pull multiplier 91 is shown in FIG. In FIG. 7, a connecting member 94 is provided inside the case 93. Pull cables 61 and 62 are connected to both ends of the connecting member 94 by pins or the like. A guide hole 95 is provided over substantially both ends of the connecting member 94, and a movable roller 96 is fitted in the guide hole 95. The roller 96 is connected to one end of the member 97 by a pin or the like, and the other end of the member 97 is connected to the pull cable 92. The other end of the pull cable 92 is connected to the member 59 and is pulled in the left direction by the torsion coil spring 57. That is, the pull multiplier 91 is configured such that the logical product of the tensions of the pull cables 61 and 62 is generated in the pull cable 92.
[0033]
The third embodiment functions as follows with the above configuration. That is, when the gate lock levers 70 and 71 are unlocked, the pull cables 61 and 62 are both pulled. Accordingly, as shown in FIG. 7, the pull cable 92 is pulled rightward, the lock pin 55 is in a state of being engaged / disengaged from the notch 53a, and the traveling lever 51 is in an unlocked state.
[0034]
When one of the gate lock levers, for example, the gate lock lever 70 is in a locked state and the other gate lock lever 71 is in an unlocked state, the pull cable 61 is in a relaxed state and the pull cable 62 is in a pulled state. The lower part of the connecting member 94 moves to the right, but the upper part remains the same. Accordingly, the roller 96 moves upward, and the pull cable 92 is in a relaxed state because no rightward tension is generated. Since the lock pin 55 is urged clockwise by the torsion coil spring 57, the lock pin 55 is engaged with the notch 53a, and the traveling lever 51 is locked.
[0035]
The same functions when the gate lock lever 71 is in the locked state and the other gate lock lever 70 is in the unlocked state. When both the gate lock levers 70 and 71 are in a locked state, the pull cables 60 and 61 are both in a relaxed state, the pull cable 92 is also in a relaxed state, and the traveling lever 51 is in a locked state. The third embodiment has the configuration and functions described above, and has the same effect as the second embodiment.
[0036]
The embodiments and examples of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the examples, and there are design changes and the like without departing from the gist of the present invention. Are also included in the present invention. For example, the spring means is not limited to the torsion coil spring, and other springs may be used.
[0037]
【The invention's effect】
As described above, according to the configurations of the first to third aspects of the present invention, the lock member is engaged with or disengaged from the notch portion to configure the lock mechanism, and the lock mechanism and the gate lock device are configured by the pull cable. As a result of adopting a configuration in which the two are connected, there is an effect that the configuration is simple, there are few failures, and the repair is easy. Moreover, according to the structure of the invention of Claim 4 and 5, the effect that it can further be easily added to an existing apparatus is acquired.
[Brief description of the drawings]
FIG. 1 shows an overall configuration of Embodiment 1 of the present invention.
FIG. 2 is a perspective view of a traveling lever locking device according to the first embodiment of the present invention.
FIG. 3 shows a gate lock lever lifting device according to the first embodiment.
FIG. 4 shows an overall configuration of Embodiment 2 of the present invention.
FIG. 5 shows a configuration example of a pull adder.
FIG. 6 shows an overall configuration of Embodiment 3 of the present invention.
FIG. 7 shows a configuration example of a pull multiplier.
FIG. 8 shows an overall configuration of a conventional apparatus 1;
FIG. 9 shows details of a lock unit of a conventional device.
10 shows a configuration of a conventional apparatus 2. FIG.
[Explanation of symbols]
50 Traveling control valve 51 Traveling levers 53, 54 Members having notches (first and second members)
53a, 54a Notch 55, 56 Lock pin (lock member)
57, 58 Biasing spring (spring means)
61, 62 Pull cable 70, 71 Gate lock lever 81, 82 Pull cable 83 Pull adder 91 Pull multiplier

Claims (5)

Gate lock levers for opening and closing the left and right passages on the left and right sides of the construction machine that can be loaded and unloaded from both the left and right sides are provided on the left and right sides of the seat to prevent malfunction of the left and right traveling levers for running the construction machine A locking device for mechanically connecting the gate lock lever and the locking device to lock the left and right traveling levers ,
The locking device includes a first member and a second member fixedly mounted, notch and disengageably a first locking member of the first member of the left and right travel levers each having the notch of the left and right travel levers And a second lock member detachably engageable with a notch portion of the second member of the left and right travel levers, and a spring means for holding each lock member in an engaged state, and the left and right gate locks Each of the levers is connected to the first lock member and the second lock member by a pull cable, and the first lock member and the second lock member are notched when the left and right gate lock levers are operated to the unlock side. A traveling lever locking device for a construction machine, wherein the traveling lever locking device is configured to be detached from a section. The lock device is a lock that integrally forms the first member and the second member so that the notch portions are at both ends, is fixed to the pivot portion of the left and right traveling levers, and engages with the notch portions. A pin is rotatably provided at a position opposite to the center line of the pivot, the lock pin is held in an engaged state by applying a biasing force by a torsion coil spring, and both the gate lock levers are operated to the unlock side. 2. The traveling lever locking device for a construction machine according to claim 1, wherein a pulling force is sometimes generated in the pull cable so that the lock pin is detached from the notch . Gate lock levers for opening and closing the left and right passages on the left and right sides of the construction machine that can be loaded and unloaded from both the left and right sides are provided on the left and right sides of the seat to prevent malfunction of the left and right traveling levers for running the construction machine A locking device for mechanically connecting the gate lock lever and the locking device to lock the left and right traveling levers,
The locking device is provided with a member having a notch portion on both of the travel levers, a lock member is provided in each notch portion in a freely detachable manner, and a spring means for holding the lock member in a detached state is provided. Connect the output side of the pull adder to the lock member, connect one end of the pull cable to each of the left and right gate lock levers so that tension is generated when operated to the lock side, and connect the other end of the pull cable to the lock member When connected to the input side of the pull adder and one or both of the gate lock levers are operated to the lock side, tension is generated on the output side of the pull adder, and the lock member resists the spring force. A traveling lever locking device for a construction machine, wherein the traveling lever locking device is configured to engage with the notch. Gate lock levers for opening and closing the left and right passages on the left and right sides of the construction machine that can be loaded and unloaded from both the left and right sides are provided on the left and right sides of the seat to prevent malfunction of the left and right traveling levers for running the construction machine A locking device for mechanically connecting the gate lock lever and the locking device to lock the left and right traveling levers,
The locking device is provided with a member having a notch portion on both of the travel levers, the lock member is detachably provided on the notch portion, and spring means for holding the lock member in an engaged state is provided. The output side of the pull multiplier is connected to the lock member, one end of the pull cable is connected to each of the gate lock levers so that tension is generated when operated to the unlock side, and the other end of the pull cable is connected to the pull member. Connected to the input side of the multiplier, and when one or both of the gate lock levers are operated to the lock side, the output side of the pull multiplier is loosened, and the lock member is engaged with the notch by the spring force. A traveling lever locking device for a construction machine, characterized by being adapted. 5. The travel lever for a construction machine according to claim 1, wherein the travel lever is directly connected to a control end of a travel control valve by a connecting member. Locking device.

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